Cosmological Evolution Across Phantom Crossing and the Nature of the Horizon
arXiv:1006.0881 · doi:10.1007/s10509-011-0704-z
Abstract
In standard cosmology, with the evolution of the universe, the matter density and thermodynamic pressure gradually decreases. Also in course of evolution, the matter in the universe obeys (or violates) some restrictions or energy conditions. If the matter distribution obeys strong energy condition (SEC), the universe is in a decelerating phase while violation of SEC indicates an accelerated expansion of the universe. In the period of accelerated expansion the matter may be either of quintessence nature or of phantom nature depending on the fulfilment of the weak energy condition (WEC) or violation of it. As recent observational evidences demand that the universe is going through an accelerated expansion so mater should be either quintessence or phantom in nature. In the present work we study the evolution of the universe through the phantom barrier (i.e. the dividing line between the quintessence and phantom era) and examine how apparent and event horizon change across the barrier. Finally, we investigate the possibility of occurrence of any singularity in phantom era.
7 pages and 4 figures
References in corpus (11)
- Dynamics of dark energy
- Cosmology and the Fate of Dilatation Symmetry
- Modified f(R) gravity consistent with realistic cosmology: from matter dominated epoch to dark energy universe
- Cosmological Evolution of a Quintom Model of Dark Energy
- Friedmann Equations of FRW Universe in Scalar-tensor Gravity, f(R) Gravity and First Law of Thermodynamics
- Dark Energy and Dark Gravity
- Generalized Second Law of Thermodynamics in Quintom Dominated Universe
- Coupled oscillators as models of quintom dark energy
- Parametrizations of the Dark Energy Density and Scalar Potentials
- Shape invariance method for quintom model in the bent brane background
- Validity of the Generalized Second Law of Thermodynamics of the Universe Bounded by the Event Horizon in Holographic Dark Energy Model